QUESTION 1 OSI is a seven-layered framework used to help define and organize the

Question

QUESTION 1

OSI is a seven-layered framework used to help define and organize the responsibilities of protocols used for network communications. It does not specifically identify which standards should be used within each layer.

True

False

10 points   

QUESTION 2

Select the OSI layer responsible for the mechanical and electrical interfaces between devices in a data network.

a. Physical Layer 1

b. Data Link Layer 2

c. Network Layer 3

d. Transport Layer 4

10 points   

QUESTION 3

Full mesh networks are commonly used on today’s modern data networks.

True

False

10 points   

QUESTION 4

Identify the type of circuit in which the user maintains exclusive 24/7 access to the physical path.

a. Dedicated Circuit

b. Switched Circuit

c. Virtual Circuit

d. Packet Switched Circuit

10 points   

QUESTION 5

Identify the type of circuit in which the user maintains the physical path through the network for the duration of the connection only. (i.e., the same physical network path is not guaranteed to the user for subsequent connections)

a. Dedicated Circuit

b. Switched Circuit

c. Virtual Circuit

d. Packet Switched Circuit

10 points   

QUESTION 6

Identify the type of circuit in which the physical network path is shared amongst numerous users, and the sharing is transparent to all users. Hint: This can only be used with digital circuits.

a. Dedicated Circuit

b. Switched Circuit

c. Virtual Circuit

d. Packet Switched Circuit

10 points   

QUESTION 7

Identify the type of circuit in which user information is separated into smaller segments, and where each segment can take different network paths to its destination.

a. Dedicated Circuit

b. Switched Circuit

c. Virtual Circuit

d. Packet Switched Circuit

10 points   

QUESTION 8

An acoustic wave is considered part of the electromagnetic spectrum. (i.e., acoustic signals are the same as electromagnetic signals).

True

False

10 points   

QUESTION 9

Either acoustic or electromagnetic signals can be used to communicate to satellites in the vacuum of space.

True

False

10 points   

QUESTION 10

Transducers are used to convert one form of signal energy into another form of signal energy. A microphone is an example of a transducer.

True

False

10 points   

QUESTION 11

An electrical signal traveling through a conductive wire is represented as changes in voltage and current within the wire.

True

False

10 points   

QUESTION 12

A changing signal current produces a corresponding electromagnetic (EM) wave.

True

False

10 points   

QUESTION 13

Radio Frequency (RF) and optical signals are both considered EM waves.

True

False

10 points   

QUESTION 14

In conductive wires (guided medium), the strength of electrical signal power determines its ability to overcome attenuation, and therefore the distance that the signal can travel through the medium.   Signal power is determined by the signal’s value of voltage and current.

True

False

10 points   

QUESTION 15

In unguided medium (free space), the electromagnetic (EM) signal wave spreads as it leaves the transmit antenna. Since the power of the EM signal resides in the surface area of the wave front, signal power is described as signal power density (i.e., watts per area).

True

False

10 points   

QUESTION 16

The spreading of an electromagnetic (EM) signal in an unguided medium such as air, weakens the EM signal therefore causing signal attenuation.

True

False

10 points   

QUESTION 17

What is correct regarding an ideal isotropic antenna?

a. An ideal isotropic antenna is a highly efficient antenna used extensively in today’s communication systems

b. An ideal isotropic antenna is a specialized antenna used to direct EM signal energy towards a specific direction

c. An ideal isotropic antenna is a theoretical antenna that does not exist in practice, but is useful in explaining power density and unguided EM signal attenuation

d. None of the above are correct statements

10 points   

QUESTION 18

Select the correct statement(s) regarding optical signals.

a. Optical signals are immune from radio frequency interference (RFI)

b. Optical signal operate in the THz frequency range, which can support high data throughput.

c. Optical signals cannot be collected using RF antennas.

d. All are correct statements

10 points   

QUESTION 19

Given the following parameters, determine the correct sinusoidal equation for a sine wave: f=1kHz, A=2v,  ? (phase angle)= -? radians.   

a. 1sin(2?5t - ?)

b. 2sin(2?1000t - ?)

c. 1sin(2?1000t)

d. 2sin(2?1t + ?)

10 points   

QUESTION 20

A sine wave has a cycle period of T=0.001 seconds. Determine the frequency and wavelength of the wave. C (speed of light) = 3E8 meters/sec.

a. frequency = 1000 Hz, ? (wavelength) = 1.5E6 meters

b. frequency = 1000 Hz, ? (wavelength) = 300E3 meters

c. frequency = 2000 Hz, ? (wavelength) = 15E6 meters

d. frequency = 2000 Hz, ? (wavelength) = 1,500,000 meters

10 points   

QUESTION 21

Select the correct relationship between a sine and cosine wave regarding phase angle.

a. sine wave leads the cosine wave

b. cosine wave leads the sine wave

c. cosine wave lags the sine wave

d. All choices are incorrect.

10 points   

QUESTION 22

All signals containing information (e.g., text, voice, video, image, etc.) have an associated frequency bandwidth. Therefore, it is important to view a signal in both the time and frequency domains.

True

False

10 points   

QUESTION 23

Modulation allows us to transmit voice and sound at higher carrier frequencies, thus enabling us to transmit information at different frequencies.

True

False

10 points   

QUESTION 24

Convert 1000 watts to decibels referenced to 1 watt.

a. 30 dBm

b. 30 dBW

c. 100dBm

d. 10dBW

10 points   

QUESTION 25

Convert 200 watt to decibels referenced to 1 milliwatt.

a. 53 dBW

b. 53 dBm

c. 130 dBm

d. 100E3 W

10 points   

QUESTION 26

Convert 120E3 mW to dBm

a. 30 dBm

b. 20.8 dBm

c. 50.8 dBm

d. 80.8 dBm

10 points   

QUESTION 27

Convert 765 watts to dBm

a. 58.84 dBm

b. 28.84 dBm

c. 300 dBm

d. 24.77 dBW

10 points   

QUESTION 28

Convert -10 dBW to milliwatts

a. 0.1 mW

b. 100 mW

c. -100 mW

d. -0.1 mW

10 points   

QUESTION 29

Convert -100 dBm to watts

a. 20 watts

b. 1E-10 watts

c. 1E-13 watts

d. -20 watts

10 points   

QUESTION 30

A baseband signal, which can either be analog or digital, is combined with a carrier wave to create a passband signal.

True

False

10 points   

QUESTION 31

A carrier is a periodic wave that can be represented by either a sine or cosine wave. Once the carrier is combined with a message (i.e., information) wave, the modulated carrier (i.e., modulated signal wave) will have a frequency bandwidth associated with it.

True

False

10 points   

QUESTION 32

Select the correct statement(s) regarding amplitude modulation (AM).

a. If the AM Index is greater than 1 (i.e., µAM>1), then over modulation occurs leading to signal distortion

b. With AM, the message is captured as amplitude changes to the carrier’s amplitude.

c. The AM modulated signal bandwidth is dependent upon the highest frequency of the message (fm)

d. All of the above are correct

10 points   

QUESTION 33

Given the following parameters, select the correct equation for the modulated carrier signal. Am=3v, Ac=3v, fm=5500Hz, fc=100MHz,?m=0, ?c=0

a. s(t) = 3[1+1.08 cos(2?5500t)] cos(2?100E6t)

b. s(t) = 3[1+1cos(2?5500t)] cos(2?100E6t)

c. s(t) = 7[1+6.5 cos(2?3500t)] cos(2?100t)

d. s(t) = 6.5[1+0.93 cos(2?100t)] cos(2?100E3t)

10 points   

QUESTION 34

Given the following AM modulated signal, determine the AM index. Will you begin to see distortion in the signal?

s(t) = 5[1+0.5 cos(2?100t)] cos(2?160E6t)

a.  µAM = 1.5, you will begin to see distortion caused by overmodulation

b.  µAM = 5, you will begin to see distortion caused by overmodulation

c.  µAM = 5, you will not see distortion caused by overmodulation

d.  µAM = 0.5, you will not see distortion caused by overmodulation

10 points   

QUESTION 35

Given the the following AM modulated signal, determine the message equation, m(t).             

s(t)=4[1+0.5 cos(2?3300t)] cos(2?100E9t)

a. m(t) = 2cos(2?3300t)

b. m(t) = 4cos(2?100E9t)

c. m(t) = 8cos(2?3300t)

d. m(t) = 2cos(2?100E9t)

10 points   

QUESTION 36

The frequency bandwidth for an AM modulated signal where fm=4000Hz is approximately ________.

a. fm=4000 Hz

b. 2fm=4000 Hz

c. 2fm=8000 Hz

d. 4fm=16,000 Hz

10 points   

QUESTION 37

Since message waves such as voice represents information in the form of changing amplitudes, message amplitudes must be converted into carrier frequency changes when using FM techniques. Kvco represents the voltage-controlled oscillator that converts amplitude changes into frequency changes, and is given in units of Hz per volts.

True

False

10 points   

QUESTION 38

Given the following message, m(t), carrier, c(t), and Kvco=3500(Hz/v), determine the FM modulated signal equation and FM index. m(t)=3cos(2?3500t), c(t)=4.5cos(2?4MHzt).

a. s(t)=4.5cos(2?4E6t + 3sin(2?3500t)), ?=3

b. s(t)=4.5cos(2?3500t + 3.5sin(2?4E6t)), ?=3.5

c. s(t)=3cos(2?3500t + 4sin(2?4000t)), ?=4

d. s(t)=3cos(2?4,000,000t + 4.5sin(2?3500t)), ?=4.5

10 points   

QUESTION 39

Given the following FM modulated signal equation, determine the original message equation, m(t).

s(t)=3 cos(2?13E9t + 1.04sin(2?13E3t)), Kvco=4500 (Hz/v)

a. m(t)= 3cos(2?13E9t)

b. m(t)= 1.04cos(2?13E3t)

c. m(t)= 1.04cos(2?13E9t)

d. m(t)= 3cos(2?13E3t)

10 points   

QUESTION 40

Given the following FM modulated signal equation, determine the frequency bandwidth. s(t)=3cos(2?13E9t + 1.04sin(2?13E3t))

a. 20kHz

b. 44kHz

c. 53 kHz

d. 106 kHz

10 points   

QUESTION 41

Given the following message, m(t), carrier, c(t), and Kp=0.25(rad/v), determine the PM modulated signal equation and PM index. m(t)=3cos(2?3500t), c(t)=4.5cos(2?4MHzt).

a. s(t)=4.5cos(2?4E6t + 0.75cos(2?3500t)), µPM=0.75

b. s(t)=4.5cos(2?3500t + 0.75cos(2?4E6t)), µPM=0.25

c. s(t)=3cos(2?4E6t + 0.75cos(2?3500t)), µPM=0.75

d. s(t)=3cos(2?3500t + 0.75cos(2?4E6t)), µPM=0.25

10 points   

QUESTION 42

Given the following PM modulated signal equation, determine the original message equation, m(t).

s(t)=4.4cos(2?2.4E9t + 0.99cos(2?5E3t)), Kp=0.33 (Hz/v)

a. m(t)= 4.4cos(2?5000t)

b. m(t)= 4.4cos(2?2.4E9t)

c. m(t)= 3cos(2?5000t)

d. m(t)= 3cos(2?2.4E9t)

10 points   

QUESTION 43

Given the following PM modulated signal equation, determine the frequency bandwidth. s(t)=3cos(2?13E9t + 2cos(2?13E3t))

a. 22kHz

b. 40kHz

c. 78 kHz

d. 116 kHz

a. Physical Layer 1

b. Data Link Layer 2

c. Network Layer 3

d. Transport Layer 4

Explanation / Answer

Question 1

OSI does not specifically identify which standards should be used within each layer.

Hence, True

Question 2

Physical Layer 1? is responsible for mechanical and electrical interfaces between devices in a data network.

Question 3

Full mesh networks are not used commonly on today’s modern data networks?

Hence. False

Question 4

Dedicated Circuit maintains exclusive 24/7 access to the physical path.

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